Cotangens - examples
- Regular 5-gon
Calculate area of the regular pentagon with side 7 cm.
How high is the building that throws horizontal shadow 95.4 m long at angle 50°?
If tg α = 0.9, Calculating sin α, cos α, cotg α .
The plane flies at altitude 6500 m. At the time of first measurement was to see the elevation angle of 21° and second measurement of the elevation angle of 46°. Calculate the distance the plane flew between the two measurements.
A straight line p given by the equation ?. Calculate the size of angle in degrees between line p and y-axis.
Between points A and B is 50m. From A we see a tree at an angle 18°. From point B we see the tree in three times bigger angle. How tall is a tree?
- How far
From the top of a lighthouse 145 ft above sea level, the angle of depression of a boat 29°. How far is the boat from the lighthouse?